14 C.F.R. § 1261.415 Execution of releases.
Title 14 - Aeronautics and Space
Upon receipt of full payment of a claim, or the amount in compromise of a claim as determined pursuant to §1261.414, the official designated in §1261.402 will prepare and execute, on behalf of the United States, an appropriate release, which shall include the provision that it shall be void if procured by fraud, misrepresentation, the presentation of a false claim, or mutual mistake of fact.
Title 14: Aeronautics and Space
PART 1261—PROCESSING OF MONETARY CLAIMS (GENERAL)
Subpart 1261.4—Collection of Civil Claims of the United States Arising Out of the Activities of the National Aeronautics and Space Administration (NASA)
§ 1261.415 Execution of releases.

